sctp_error_invalid_stream
struct sctp_error_invalid_stream *cause;
op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_invalid_stream),
cause = mtod(op_err, struct sctp_error_invalid_stream *);
SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_invalid_stream);
cause->cause.length = htons(sizeof(struct sctp_error_invalid_stream));